<template>
  <div v-show="list.length">
    <div class="list-control">
      <div class="list-control-filter">
        <span>品牌：</span>
        <span
          class="list-control-filter-item"
          :class="{ on: filterBrand.includes(item) }"
          v-for="item in brands"
          @click="handleFilterBrand(item)"
        >{{ item }}</span>
      </div>
      <div class="list-control-filter">
        <span>颜色：</span>
        <span
          class="list-control-filter-item"
          :class="{ on: item === filterColor }"
          v-for="item in colors"
          @click="handleFilterColor(item)"
        >{{ item }}</span>
      </div>
      <div class="list-control-order">
        <span>排序：</span>
        <span
          class="list-control-order-item"
          :class="{ on: order === '' }"
          @click="handleOrderDefault"
        >默认</span>
        <span
          class="list-control-order-item"
          :class="{ on: order === 'sales' }"
          @click="handleOrderSales"
        >
          销量
          <template v-if="order === 'sales'">↓</template>
        </span>
        <span
          class="list-control-order-item"
          :class="{ on: order.indexOf('cost') > -1 }"
          @click="handleOrderCost"
        >
          价格
          <template v-if="order === 'cost-asc'">↑</template>
          <template v-if="order === 'cost-desc'">↓</template>
        </span>
      </div>
    </div>
    <Product
      class="test-product"
      v-for="item in filteredAndOrderedList"
      :info="item"
      :key="item.id"
    ></Product>
    <div class="product-not-found" v-show="!filteredAndOrderedList.length">暂无相关商品</div>
  </div>
</template>
<script setup>
import { ref, computed } from "vue";
import Product from "../components/product.vue";
import product_data from "../product.js";

const list = computed(() => {
  return product_data;
});

const brands = computed(() => {
  const b = [];
  product_data.forEach(p => {
    if (!b.includes(p.brand)) {
      b.push(p.brand);
    }
  });
  return b;
});

const colors = computed(() => {
  const c = [];
  product_data.forEach(p => {
    if (!c.includes(p.color)) {
      c.push(p.color);
    }
  });
  return c;
});

const filteredAndOrderedList = computed(() => {
  let list = [...product_data];
  // 按品牌过滤
  if (filterBrand.value.length) {
    list = list.filter(item => filterBrand.value.includes(item.brand));
  }
  // 按颜色过滤
  if (filterColor.value !== "") {
    list = list.filter(item => item.color === filterColor.value);
  }
  // 排序
  if (order.value !== "") {
    if (order.value === "sales") {
      list = list.sort((a, b) => b.sales - a.sales);
    } else if (order.value === "cost-desc") {
      list = list.sort((a, b) => b.cost - a.cost);
    } else if (order.value === "cost-asc") {
      list = list.sort((a, b) => a.cost - b.cost);
    }
  }
  return list;
});

const filterBrand = ref([]);
const filterColor = ref("");
const order = ref("");

function handleFilterBrand(brand) {
  if (filterBrand.value.includes(brand)) {
    filterBrand.value = filterBrand.value.filter(i => i != brand);
  } else {
    filterBrand.value.push(brand);
  }
}

function handleFilterColor(color) {
  if (filterColor.value === color) {
    filterColor.value = "";
  } else {
    filterColor.value = color;
  }
}

function handleOrderDefault() {
  order.value = "";
}

function handleOrderSales() {
  order.value = "sales";
}

function handleOrderCost() {
  if (order.value === "cost-desc") {
    order.value = "cost-asc";
  } else {
    order.value = "cost-desc";
  }
}
</script>
<style scoped>
.list-control {
  background: #fff;
  border-radius: 6px;
  margin: 16px;
  padding: 16px;
  box-shadow: 0 1px 1px rgba(0, 0, 0, 0.2);
}

.list-control-filter {
  margin-bottom: 16px;
}

.list-control-filter-item,
.list-control-order-item {
  cursor: pointer;
  display: inline-block;
  border: 1px solid #e9eaec;
  border-radius: 4px;
  margin-right: 6px;
  padding: 2px 6px;
}

.list-control-filter-item.on,
.list-control-order-item.on {
  background: #f2352e;
  border: 1px solid #f2352e;
  color: #fff;
}

.product-not-found {
  text-align: center;
  padding: 32px;
}
</style>